Abyss - OSRS Wiki

The Abyss is an area of Abyssal Space that contains rifts created by the Zamorak Magical Institute with which they directly access the runic altars without the need for a talisman, with the exception of the Astral and Wrath Altar. Accessing this area of the Abyss requires completion of the miniquest Enter the Abyss. In appearance, it seems to be oddly organic, with eyes, boils, and strange-looking tendrils. This is because the areas of the Abyss that players visit are the corpse of an unfathomably large chthonian demon named Hostilius[1], with this part being the stomach or heart.[2]

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Enter the Abyss - OSRS Wiki